Mati Syra Zemia (Moist Mother Earth), Slavic mother goddess, is probably one of the oldest and most important deities. Her name explicitly describes her as forever fertile, life-giving and reproductive force. The cult of the mother goddess originates from the period of matriarchy, the system that, in some of its forms, lasted among the Slavs even until the 10th century. Records on the life of lady Olga (second half of the 10th century) mention that the women of that age had almost the same rights as the men. Olga herself was the owner of a land, and she ruled over it before she married lord Igor, whose throne she inherited.